CN214500204U

CN214500204U - Pilot valve

Info

Publication number: CN214500204U
Application number: CN202022390716.0U
Authority: CN
Inventors: 曹毅; 宗献红; 孙涛
Original assignee: CHANGZHOU HUIFENG MARINE ACCESSORY PRODUCE CO LTD
Current assignee: CHANGZHOU HUIFENG MARINE ACCESSORY PRODUCE CO LTD
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-10-26
Anticipated expiration: 2030-10-23

Abstract

The utility model relates to a pilot valve, including the pilot valve body, the valve gap, valve rod and valve disc, the middle part of pilot valve body sets up the valve pocket, the both sides of valve pocket are arranged respectively in to water inlet and delivery port, the top setting of valve pocket is suitable for the valve rod hole that the valve rod passes through, the bottom setting of valve rod is used for carrying out the valve disc that cuts off to the valve pocket, the top of valve rod is stretched out the pilot valve body and is got into the diaphragm cavity of resorption and cooperate with the central transmission of diaphragm, the top of valve gap sets up the adjusting screw of liftable, set up first spring in the valve gap, adjusting screw's bottom stretch into in the valve gap and cooperate with the top transmission of first spring, the bottom of first spring cooperates with the central transmission of diaphragm, the bottom of valve disc sets up the second spring that is used for supporting the valve disc, set up the feedback hole between delivery port and the diaphragm cavity of resorption, first spring, the valve rod, the valve disc, the second spring sets up with the axle center.

Description

Pilot valve

Technical Field

The utility model relates to a control valve field, especially a pilot valve.

Background

The pressure control of the fluid pipeline is generally applied to a pressure control system, the pressure control system generally comprises a main valve and a pilot valve, and the main valve is connected in series in the fluid pipeline; the pilot valve is connected with the main valve, and the water outlet pressure of the main valve is adjusted by adjusting the pilot valve; the pressure reducing valve is mainly used for a large-diameter water pressure reducing valve group product, and has the functions of reducing the pressure of a pilot pipeline system of the large-diameter water pressure reducing valve group, ensuring the pressure of an upper cavity of a main valve and automatically keeping the pressure of an outlet of the main valve stable by means of the energy of a medium. The existing pilot valve has a complex structure and poor sealing effect.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a simple structure, sealed excellent pilot valve of effect.

In order to solve the technical problem, the utility model provides a pilot valve, including pilot valve body, valve gap, valve rod and valve disc, the bottom of valve gap is fixed with the pilot valve body and links to each other so as to form the diaphragm cavity, and set up the diaphragm between valve gap and the pilot valve body, divide the diaphragm cavity into diaphragm epicoele and diaphragm cavity of resorption by the diaphragm, the middle part of pilot valve body sets up the valve pocket, and water inlet and delivery port are placed in the both sides of valve pocket respectively, and the top of valve pocket sets up the valve rod hole that is suitable for the valve rod to pass through, and the bottom of valve rod sets up the valve disc that is used for carrying out the wall to the valve pocket, and the top of valve rod stretches out the pilot valve body and gets into the diaphragm cavity of resorption and cooperates with the central transmission of diaphragm, and the top of valve gap sets up liftable adjusting screw, sets up first spring in the valve gap, and the top transmission cooperation of first spring is stretched into the valve gap and the top of first spring, and the central transmission cooperation of diaphragm, a second spring for supporting the valve disc is arranged at the bottom end of the valve disc, a feedback hole is arranged between the water outlet and the diaphragm lower cavity, and the first spring, the valve rod, the valve disc and the second spring are coaxially arranged; when the high-pressure fluid pressure is larger than the set value of the pilot valve, the valve rod drives the valve disc to move upwards under the action of the diaphragm to reduce the opening and maintain the pressure to be stable; when the pressure of the water outlet is lower than the set value of the pilot valve, the valve rod drives the valve disc to move downwards under the action of the diaphragm, the opening degree is increased, and the pressure stability is maintained.

Furthermore, the valve disc is made of butadiene-acrylonitrile rubber through injection molding, and soft sealing of the valve cavity is achieved.

Furthermore, the valve cavity is provided with a valve cavity water inlet with a circular section, the valve disc is a conical valve disc matched with the valve cavity water inlet in shape, the outer diameter of the top end of the conical valve disc is smaller than the inner diameter of the valve cavity water inlet, and the outer diameter of the bottom end of the conical valve disc is larger than the inner diameter of the valve cavity water inlet, so that soft sealing is formed between the conical valve disc and the valve cavity water inlet when the conical valve disc ascends.

Furthermore, the valve cavity is provided with a valve cavity water outlet with a circular section, the valve disc is a circular valve disc matched with the shape of the valve cavity water outlet, and the outer diameter of the circular valve disc is larger than the inner diameter of the valve cavity water outlet, so that the end face of the circular valve disc is tightly attached to the valve cavity water outlet when the circular valve disc rises to seal the valve cavity water outlet.

Furthermore, the pilot valve also comprises a filter cavity arranged between the water inlet and the valve cavity, one end of the filter cavity is communicated with the water inlet, the other end of the filter cavity is communicated with the valve cavity, and a filter screen is arranged in the filter cavity so that fluid is filtered by the filter screen before entering the valve cavity.

Further, the filter screen is a stainless steel filter screen with 20 meshes.

The technical effects of the utility model are that: (1) compared with the prior art, the pilot valve of the utility model is manufactured by injection molding of nitrile rubber, so as to realize soft sealing, the sealing effect of the soft sealing is stronger than that of hard sealing, zero leakage can be realized, the sealing material adopts nitrile rubber with better water resistance and has certain elasticity, the pilot valve can be used for a long time, and the processing precision is relatively lower than that of the hard sealing; (2) the pilot valve is integrally in a direct-acting design structure, the regulation is sensitive, the reaction speed is high, and the regulation of the pressure of the water outlet is accurate and the fluctuation is small after a feedback hole of the pressure of the water outlet is optimized through a test; (3) the valve disc of the pilot valve is vulcanized on the valve rod, the structure is simple and integrated, the installation and debugging are convenient, and in addition, the parts adopt a conical sealing structure and have the function of self-positioning guiding sealing; (4) the pilot valve body is mainly made of ZQSn10-2, so that the pilot valve has the advantages of good corrosion resistance, wear resistance and cutting processing performance, high casting compactness and good air tightness, and the corrosion resistance in seawater medium for a long time is obviously superior to that of common stainless steel; (5) the filter screen is arranged in front of the valve cavity, the filtering precision is 20 meshes, larger particles are effectively filtered, and the sealing surface of the valve disc can be better protected.

Drawings

The invention will be described in further detail with reference to the accompanying drawings:

fig. 1 is a schematic sectional structure view of a pilot valve according to embodiment 1 of the present invention;

FIG. 2 is an enlarged partial schematic view of region A of FIG. 1;

fig. 3 is a schematic sectional structure view of a pilot valve according to embodiment 2 of the present invention;

in the figure:

the pilot valve comprises a pilot valve body 1, a diaphragm 2, a diaphragm upper cavity 3, a diaphragm lower cavity 4, a conical valve disc 5, a valve cover 6, an adjusting screw rod 7, a locking nut 8, a spring seat 9, a first spring 10, a fixing nut 11, a valve seat 12, a gasket 13, a valve rod 14, a second spring 15, a first sealing ring 16, a bottom valve cover 17, a water inlet 18, a water outlet 19, a valve cavity water inlet channel 20, a feedback hole 21, a valve cavity 22, a filter cavity 23, a filter cavity bottom cover 24, a second sealing ring 25, a circular valve disc 26, a third sealing ring 27, a fastening bolt 28 and a filter cavity water inlet 29.

Detailed Description

Example 1

As shown in fig. 1 to 2, the pilot valve of this embodiment includes a pilot valve body 1, a valve cover 6, a valve rod 14 and a conical valve disk 5, the bottom of the cylindrical valve cover 6 is fixedly connected to the pilot valve body 1 through a fastening bolt to form a diaphragm cavity, a diaphragm 2 is arranged between the valve cover 6 and the pilot valve body 1, the diaphragm cavity is divided into a diaphragm upper cavity 3 and a diaphragm lower cavity 4 by the diaphragm 2, an adjusting screw 7 capable of spirally lifting is arranged at the top end of the valve cover 6, the adjusting screw 7 is in threaded fit with the valve cover 6, a locking nut 8 in threaded fit is arranged on the adjusting screw 7, and the locking nut 8 is arranged outside the valve cover 6, so that the adjusting screw 7 can be screwed by the locking nut 8 after rotating to a desired position; the bottom end of the adjusting screw 7 extends into the valve cover 6 and is fixedly connected with the top of the spring seat 9, the bottom of the spring seat 9 is provided with a guide column, and the top end of the first spring 10 is in sleeved fit with the guide column; the center of diaphragm 2 sets up disk seat 12, and disk seat 12 includes chassis and the stand that integrated into one piece set up, and the stand passes the center setting of diaphragm 2, and sets up the external screw thread on the stand, and diaphragm 2 top sets up packing ring 13 and fixation nut 11 for fix disk seat 12 in the center of diaphragm 2, cup joint the bottom of first spring 10 outside fixation nut 11, so that can drive diaphragm 2 when first spring 10 compresses and remove.

The middle part of the pilot valve body 1 is provided with a valve cavity 22, a water inlet 18 and a water outlet 19 are respectively arranged on two sides of the valve cavity 22, the top of the valve cavity 22 is provided with a valve rod hole suitable for a valve rod 14 to pass through, the bottom of the valve cavity 22 is provided with a valve cavity water inlet, the cross section of the valve cavity water inlet is circular, the bottom of the valve rod 14 is provided with a conical valve disc 5 used for sealing the valve cavity water inlet, the outer diameter of the top end of the conical valve disc 5 is smaller than the inner diameter of the valve cavity water inlet, the outer diameter of the bottom end of the conical valve disc 5 is larger than the inner diameter of the valve cavity water inlet, and the conical valve disc 5 is vulcanized on the bottom of the valve rod 14 by butadiene-acrylonitrile rubber so that the conical valve disc 5 forms soft seal with the valve cavity water inlet when ascending; the top end of the valve rod 14 extends out of the pilot valve body 1, enters the diaphragm lower cavity 4 and is fixedly connected with the valve seat 12 in the center of the diaphragm 2, the bottom end of the pilot valve body 1 is provided with a bottom valve cover 17 aligned with the valve cavity 22, and the bottom valve cover 17 and the pilot valve body 1 are sealed through a first sealing ring 16; a second spring 15 for supporting the conical valve disc 5 is arranged between the bottom valve cover 17 and the conical valve disc 5, a valve cavity water inlet passage 20 is arranged between the water inlet 18 and the valve cavity water inlet, and the valve cavity water inlet passage 20 is separated from the valve cavity water inlet after the conical valve disc 5 seals the valve cavity water inlet; one side of the valve cavity 22 is directly communicated with the water outlet 19, a feedback hole 21 is arranged between the water outlet 19 and the diaphragm lower cavity 4, and the first spring 10, the valve rod 14, the conical valve disc 5 and the second spring 15 are coaxially arranged; when the pilot valve is used, after high-pressure fluid enters the pilot valve body 1 through the water inlet 18, the second spring 15 drives the conical valve disc 5 to seal a water inlet of a valve cavity, at the moment, the pilot valve is in a closed state, the adjusting screw 7 is rotated to compress the first spring 10, the first spring 10 drives the diaphragm 2, the diaphragm 2 drives the valve rod 14, and the valve rod 14 drives the conical valve disc 5 to descend, so that the water inlet of the valve cavity is opened, the high-pressure fluid enters the valve cavity 22 through the water inlet 18, the water inlet of the valve cavity and the water inlet of the valve cavity, flows out of the valve cavity 22 and then reaches the water outlet 19, and enters the lower diaphragm cavity 4 through the feedback hole 21 to balance the pressure of the water outlet, when the pressure of the water outlet is greater than a set value of the pilot valve, the fluid entering the lower diaphragm cavity 4 is increased, the valve rod 14 drives the conical valve disc 5 to move upwards under the action of the diaphragm 2, the opening is reduced, and the pressure is kept stable; when the pressure of the water outlet is lower than the set value of the pilot valve, the fluid entering the lower cavity 4 of the diaphragm is reduced, and the valve rod 14 drives the conical valve disc 5 to move downwards under the action of the diaphragm 2, so that the opening degree is increased, and the pressure stability is maintained.

The inlet and outlet drift diameter of the pilot valve is DN6, the specification of threaded connection is G3/8", the working medium is fresh water or seawater, the working temperature is 0-80 ℃, the rated working pressure is 1.6MPa, and the pressure regulating range is 0.1-0.7 MPa.

Example 2

As shown in fig. 3, the pilot valve of this embodiment includes a pilot valve body 1, a valve cover 6, a valve rod 14 and a circular valve disc 26, the bottom of the cylindrical valve cover 6 is fixedly connected to the pilot valve body 1 through a fastening bolt 28 to form a diaphragm cavity, a diaphragm 2 is arranged between the valve cover 6 and the pilot valve body 1, the diaphragm cavity is divided into a diaphragm upper cavity 3 and a diaphragm lower cavity 4 by the diaphragm 2, an adjusting screw 7 capable of spirally lifting is arranged at the top end of the valve cover 6, the adjusting screw 7 is in threaded fit with the valve cover 6, a locking nut 8 in threaded fit is arranged on the adjusting screw 7, and the locking nut 8 is arranged outside the valve cover 6, so that the adjusting screw 7 can be screwed by the locking nut 8 after rotating to a desired position; the bottom end of the adjusting screw 7 extends into the valve cover 6 and is fixedly connected with the top of the spring seat 9, the bottom of the spring seat 9 is provided with a guide column, and the top end of the first spring 10 is in sleeved fit with the guide column; the center of diaphragm 2 sets up disk seat 12, and disk seat 12 includes chassis and the stand that integrated into one piece set up, and the stand passes the center setting of diaphragm 2, and sets up the external screw thread on the stand, and diaphragm 2 top sets up packing ring 13 and fixation nut 11 for fix disk seat 12 in the center of diaphragm 2, cup joint the bottom of first spring 10 outside fixation nut 11, so that can drive diaphragm 2 when first spring 10 compresses and remove.

The pilot valve comprises a pilot valve body 1, wherein a valve cavity 22 is arranged in the middle of the pilot valve body 1, a water inlet 18 and a water outlet 19 are respectively arranged on two sides of the valve cavity 22, a valve rod hole suitable for a valve rod 14 to pass through is formed in the top of the valve cavity 22, a valve cavity water outlet is formed in the bottom of the valve cavity 22, the cross section of the valve cavity water outlet is circular, a circular valve disc 26 matched with the shape of the valve cavity water outlet is formed in the bottom of the valve rod 14, the outer diameter of the circular valve disc 26 is larger than the inner diameter of the valve cavity water outlet and used for sealing the valve cavity water outlet to isolate the valve cavity 22, and the circular valve disc 26 is made of nitrile rubber through injection molding, so that the end face of the circular valve disc 26 is tightly attached to the valve cavity water outlet when the circular valve disc 26 rises to form sealing on the valve cavity water outlet.

The top end of the valve rod 14 extends out of the pilot valve body 1 to enter the diaphragm lower cavity 4 and is fixedly connected with the valve seat 12 in the center of the diaphragm 2, the valve rod 14 is sleeved with a third sealing ring 27 for separating the valve cavity 22 from the diaphragm lower cavity 4, the bottom end of the pilot valve body 1 is provided with a bottom valve cover 17 aligned with the valve cavity 22, and the bottom valve cover 17 and the pilot valve body 1 are sealed through a first sealing ring 16; a second spring 15 for supporting the circular valve disc 26 is arranged between the bottom valve cover 17 and the circular valve disc 26, a filter cavity 23 is arranged between the water inlet 18 and the valve cavity 22, a filter cavity bottom cover 24 is arranged at the bottom of the filter cavity 23, and the filter cavity bottom cover 24 is sealed by a second sealing ring 25; one end of the filter cavity 23 is communicated with the water inlet 18 through the filter cavity water inlet 29, the other end of the filter cavity 23 is communicated with the middle part of the valve cavity 22 through the valve cavity water inlet passage 20, and a stainless steel filter screen with 20 meshes is arranged in the filter cavity 23 so that the fluid is filtered by the filter screen before entering the valve cavity 22; a valve cavity water outlet at the bottom end of the valve cavity 22 is communicated with the water outlet 19, a feedback hole 21 is formed between the water outlet 19 and the diaphragm lower cavity 4, the valve cavity 22 is isolated from the water outlet 19 after the circular valve disc 26 seals the water outlet of the valve cavity, and the first spring 10, the valve rod 14, the circular valve disc 26 and the second spring 15 are coaxially arranged; when in use, after high-pressure fluid enters the pilot valve body 1 through the water inlet 18, the second spring 15 drives the circular valve disc 26 to seal the water outlet of the valve cavity, at the moment, the pilot valve is in a closed state, the adjusting screw 7 is rotated to compress the first spring 7, the first spring 7 drives the diaphragm 2, the diaphragm 2 drives the valve rod 14, the valve rod 14 drives the circular valve disc 26 to descend, so that the water outlet of the valve cavity is opened, the high-pressure fluid enters the valve cavity 22 through the water inlet 18, the water inlet 29 of the filter cavity, the filter cavity 23 and the water inlet channel 20 of the valve cavity, flows out of the valve cavity 22 through the water outlet of the valve cavity, reaches the water outlet 19, and enters the lower diaphragm cavity 4 through the feedback hole 21 to balance the pressure of the water outlet, when the pressure of the water outlet is greater than the set value of the pilot valve, the fluid entering the diaphragm lower cavity 4 is increased, and the valve rod 14 drives the circular valve disc 26 to move upwards under the action of the diaphragm 2, so that the opening degree is reduced, and the pressure is maintained to be stable; when the pressure of the water outlet is lower than the set value of the pilot valve, the fluid entering the lower cavity 4 of the diaphragm is reduced, and the valve rod 14 drives the circular valve disc 26 to move downwards under the action of the diaphragm 2, so that the opening degree is increased, and the pressure stability is maintained.

The inlet and outlet drift diameter of the pilot valve is DN15, the specification of threaded connection is M22 multiplied by 1.5, the working medium is fresh water or seawater, the working temperature is 0-80 ℃, the rated working pressure is 1.6MPa, and the pressure regulating range is 0.1-0.7 MPa.

It should be understood that the above examples are only for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And that obvious changes and modifications may be made without departing from the spirit of the invention.

Claims

1. A pilot valve is characterized by comprising a pilot valve body, a valve cover, a valve rod and a valve disc, wherein the bottom of the valve cover is fixedly connected with the pilot valve body to form a diaphragm cavity, a diaphragm is arranged between the valve cover and the pilot valve body and divides the diaphragm cavity into a diaphragm upper cavity and a diaphragm lower cavity, a valve cavity is arranged in the middle of the pilot valve body, a water inlet and a water outlet are respectively arranged on two sides of the valve cavity, a valve rod hole suitable for the valve rod to pass through is formed in the top of the valve cavity, the valve disc used for separating the valve cavity is arranged at the bottom of the valve rod, the top end of the valve rod extends out of the pilot valve body to enter the diaphragm lower cavity and is in transmission fit with the center of the diaphragm, a liftable adjusting screw rod is arranged at the top end of the valve cover, a first spring is arranged in the valve cover, the bottom end of the adjusting screw rod extends into the valve cover and is in transmission fit with the top end of the first spring, and the bottom end of the first spring is in transmission fit with the center of the diaphragm, the bottom end of the valve disc is provided with a second spring for supporting the valve disc, a feedback hole is arranged between the water outlet and the diaphragm lower cavity, and the first spring, the valve rod, the valve disc and the second spring are coaxially arranged.

2. A pilot valve as claimed in claim 1, wherein the valve disc is injection moulded from nitrile rubber.

3. The pilot valve as claimed in claim 1 or 2, wherein the valve chamber is provided with a valve chamber water inlet with a circular cross section, the valve disc is a tapered valve disc matched with the shape of the valve chamber water inlet, the outer diameter of the top end of the tapered valve disc is smaller than the inner diameter of the valve chamber water inlet, and the outer diameter of the bottom end of the tapered valve disc is larger than the inner diameter of the valve chamber water inlet, so that the tapered valve disc forms a soft seal with the valve chamber water inlet when ascending.

4. The pilot valve according to claim 1 or 2, wherein the valve chamber is provided with a valve chamber water outlet with a circular cross section, the valve disc is a circular valve disc matched with the valve chamber water outlet in shape, and the outer diameter of the circular valve disc is larger than the inner diameter of the valve chamber water outlet, so that the end surface of the circular valve disc is tightly attached to the valve chamber water outlet when the circular valve disc rises, and the valve chamber water outlet is sealed.

5. The pilot valve as recited in claim 4, further comprising a filter chamber disposed between the water inlet and the valve chamber, one end of the filter chamber being in communication with the water inlet, the other end of the filter chamber being in communication with the valve chamber, a screen being disposed in the filter chamber to allow fluid to be filtered by the screen before entering the valve chamber.

6. A pilot valve as claimed in claim 5, wherein the screen is a 20 mesh stainless steel screen.